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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5caedc6e54a47fad397484b87e3568a8304c75703e20e8bbc9352c8a6788d6f6' 
  AND token = 'kKOtEXchZnVcm68aBBZhRPJbiM+hILNyhkRe2/gkOwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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