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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5699ca6230c7c7344cdd7ef078a04509f6ba960a8dac1029e84cc3b6d2f4b30' 
  AND token = 'mYbTL/H21ZU9gc8LQKm4xs25X7a1urn1QDs3SmeDSCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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