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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e16bbd347903f5333e18570cb943183396a50900c19a8c48e9d856007e2059c' 
  AND token = '+cU2J7jW901MD4tJiRNFZuXQJFrY9BrTqnrCBTQJdLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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