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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43646d1ee4f7e7584e48cd599acaf1a94b6917f65ed6046327c35f30644ea8f2' 
  AND token = 'vK9SN/BfL+4bqWtq1ESq/CceetDoYXQJJPf6n2uVddk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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