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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b5bbd34b1eb8cd7f4cd8ecb913f138f27f56b0755e95d05f060dd4c3a89aee5' 
  AND token = 'trL9bmrMXv3868r9nNwbl+tASdHm7XrqJ5tTrexLKok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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