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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b4b2501cec5a08ec1f4d32502f6a906aa01f7766bffa70b06dc8f32e54958ad' 
  AND token = 'y3I2iohDpSPb9wAgitPiWwpS0wRj/6hO4XIutG43qdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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