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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c5f987e5537d6ce1aa80d84d5a46213d19e9f5d33075b98989a1633d03a4ac4' 
  AND token = 'hbJWAc/RnUmAAu6NXeDD1Fa3R2w2Zx/0pWMaCZ4yGBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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