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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9117fa74a4f11bd47b0bc49cf388bc11a1bd47f83868c175dffe7348bc4a8d9d' 
  AND token = 'XLoaB7nzzJ3EZuJaQLr9+okcuqyGz9/kbQXGyqaGnkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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