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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfc392d7ef0f06181feed407c7130958dfeb3f9d2bf6b448c5be096490c20af1' 
  AND token = '4CK5Jr4aLQIK5NHKmVK9zDKtvgWc89VWi3ccA1VQVyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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