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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56db79556995f970ab7b5f32bf8fe53a0ca9b9ca44fdef335084b6294ec10b5d' 
  AND token = '1IWq0HHWFUND5HllHV2RPFJNW4U+ljXe4Yzdshi6cLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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