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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb942034cac8a1fd5481af88e06373068c6b97859402f35a18ac8b32493f0a1a' 
  AND token = 'TZ1w3SG4LGhCLC1XuLUO3msBo1dMHRniN9QR9TOtzxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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