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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0be9c87ace3432a7b814dbfa4c5cf2ae5af6fe53ba59b248ba345d3422c65db2' 
  AND token = 'dgLCABt0P6FR42GINGkfT0ACwJbt5SCKjc+L4eRtte4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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