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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4e2bd2696d17f26e31e3933fb326b42d6c0de3435edab6bcafcd6278f87269d' 
  AND token = '39cfjsNyIggtiQs4scYyDNT7zTd5OUmatC3LhqD7B5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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