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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '692b52743f252a0279b0e459c679aec9bf17683509d16f30f4db663aad579dd3' 
  AND token = '36mBRt8pxU5kiV1V9t6uD29nO2UVR43k/3RTbnjlX1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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