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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af1a30fa9ff2d734281543b7e633597fa0139d0ba995988593b001968cd8d574' 
  AND token = '6MdB5oWVlrK227Yr3zRFeDc6HPuBxKgcPa/1TBsY3YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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