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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '812b0b49d5cfe7a37b76dab9850965f5d245c119b56ef2fcd9e1362130e2e1b6' 
  AND token = 'hIMPx8/p9i6u+DroKNr3SZC0/52EKyc3NtxDlXjM9is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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