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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6ccf5a80d62f924b8b85c55d5aa31d113fb07d420c7d5058495152ad444ba38' 
  AND token = 'Pt3yFYY0lG4CYcEr0n04ix7Lwrt8ZQqv7o/YcIu2Z9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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