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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91e535df00dd44a834065ef3299f79ada667f2611986c0d995f0ba29f9d2e680' 
  AND token = 'LQ+PXgd/jepbNbb49pQ9PC5UW76Fqazg7MXeoAXC9KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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