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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8ff21cdd4133971ecf1b0fc4052e5fbee6491f2a2ff94786cc8defbe87aaf9f' 
  AND token = 'uEu6mm3K3qqx0kphWRGo3N12peVhE7x8TaWDFGPzT/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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