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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '537b28d6bec2c8514181aeacf311f1c0b497789cbb2b1e1c949c43ebc606901f' 
  AND token = 'dVaP/hEgZHHjT//GIV8apbrZ2oXEAfHw97QjowHqNgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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