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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f50048c0eca0c9e94d9a04f89b387e1d52e8a5497fecde9d78630bd29ee1b205' 
  AND token = 'igm5eSiEtca0OQiuIFjAfau5CiyOWP/X+wTalIGTaCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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