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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a7f6dabf4c7c2555dc9ae42ae3276e41275337c1a6389c432ade149ec279978' 
  AND token = 'h8VpVpiRXROlTaqHLXNenoIJb22K4UjC9UwqUQLMYbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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