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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ce9c171e020cd51728c19d93f8e103ce61eacac3d40bc63f09e2c71f9990c7a' 
  AND token = 'W7FH3ndhlva7kpQvDSeQmCXg+OoX769AU/gPAKaLYfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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