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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '911bc0dd11fbf92dd7463d5499f379b9d99f15bde8b63ac1c8e49d09b95121df' 
  AND token = 'Ts5ITVlPWsoJg7JyGL8G9cwn0IRuweYfzJphmeQPU3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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