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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78b2bef43fba8969fd689f8dd9f58eea4143ee7d0e9a56d0e4332063f25109ac' 
  AND token = 'vkuwCfHSmtM4oI8qAeVr0E6zc/sZ1+Og4iutm6pZivA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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