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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78a8a5621096743cd8324307ce8e70b098ce5d4456b82930b66c59166c3c270a' 
  AND token = '3rUHeYUh4KqDPIo60aYbaYq41VDFuSbvGd+KatKI1Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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