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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd761507308af5ea1962a294925b211b66faf873f4edcc19692536b28d16213d0' 
  AND token = 'igWfq/k/GUUlkf/2v9P6xdqpajNr5x6IiZsPZWXRO5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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