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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9e6108ad33863cb57b408f1bb7f0e2365b4e0b5e9ccfa8198bcf025ae0ead06' 
  AND token = 'mj9HbwxlMPWinQ5+33hT0jqsnfNnWlZ6z/8GCtKC5Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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