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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69d47886d69cbcf06c9dc0a08267f43f5ce7b3f4e6a62f605ffc6830523831cd' 
  AND token = 'C8iP0bl6cSE0M+cgrq6xfNQdu/IzgFZVbFRyQ2poWMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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