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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b12fe63b2cdf2b9b00bb34e34d23172115596b2a07ab69db7042cd95fa7ca9b8' 
  AND token = 'WSNu0GkzX7XWqkdEEx1MyibvhwmjODSycZ9F8uU3rt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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