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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94abcb10512ff31dac3efd2c71eec07e0e311c3c93459f634026bf00abee1887' 
  AND token = 'EmXdQxFQbpirE91bIGhX4L4XvFxgr02R6MydYjLx8sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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