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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c621320812dd2b88becb47911c3d278e86fe9adb22be04b3a9a0156aa2c3ca9' 
  AND token = 'c98ZBSxCpc05o60zSZnUBMFQA85RYI9h/hI1EYYQX1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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