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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94d14d221c93b452c980ea503be8de1c6c8ae1d1e9338ead1338ad6e8a98a079' 
  AND token = 'NpKJ2dWkZlx8Dzvr+I5HJi21kj2ylSFJMRpkQ1jAz3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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