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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0891c8497f8110164471205f88baddf310d0f2031f09845ee55c4b80c1bcabf' 
  AND token = 'UN23GGsTI8JSQ0FaQ8g8QrBQx0Ja2APiqWIy8coMATQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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