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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7612b93b7eff537ea1654c427f10f0dfba946d9afa29dc049192924c06701d86' 
  AND token = 'ZMlN4go0v0F7TguU1OtXZFxcC0gGfNfZ9xGiXilTtkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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