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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbb32b3b5c8cf8f2db43962e5268f7ab162e97ffb5b67d19b2ef2da680cf400f' 
  AND token = 'zOXa0DCbCo+NR+S1atRRmPIs4KZHIyGhAeUc6We72kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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