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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e25a879d427767366eecfc2d8240654e35af723aa8d87f481f0a20767d9ce06' 
  AND token = 'Rg7RrnrsJ9eD2n4Eq2Ceeu6J1TxBtCvPDn6WKSJVOuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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