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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59ed412145a99c9d34107a53fa48a0a0b97b6b9f76fee71e90aaf73b0a5f932c' 
  AND token = '7x9jFSvpi9s6Dh34SMQ4ts09eix48H5/ZzG1cS7LERs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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