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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88239781a5f86e783c1de9c47ba58d70036d4b851b6fa273ce8c38282a770170' 
  AND token = 'ZlNDYwM2sR1HATVSE/+misl69l9jQD9gM9Ljxk7/Wn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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