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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a845ceab458216bbfcadf53c65fe24379d616af925a9ee68e403c639d9e7e4de' 
  AND token = 'bGPmlaDT6InYajU2jR/v7OvZdh1x33hV10lsb7RjpoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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