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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0ff7e5ce90ae1e9211c429a91112e7671a5fd9ddbd2df523974f56afcd49ac5' 
  AND token = 'ctcCXyyRk6Pq9Ir/RDzrVXEeCa5z2x8uuiXu5tlSonM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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