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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28898e140c7c04fb70c74dc2e98f4137d7370f1343c2cf946e9ad289aa904dcf' 
  AND token = 'UXsEX7UsVT9F+zEccAgUxm2fIQqmf/DDDzLLAPQ6G9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}