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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ba4f26c98ade2c2f73c816f04b1ea3b6578c804203f59b4978314f599a51138' 
  AND token = '/ZocKAYlyo8/P6oQI9cW90mfVPyWzs12TYfeSMlmWYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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