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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6928d9e2f43b490edb1d281ccc6b4a7c34a6918afcd0ca80063990735cd27121' 
  AND token = '7OGw1Up38GTKF6r0WSf02tdwctDTefwAvf1nwC6apvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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