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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cab63788b698b922de8ffae055cde10e78d2fd19e232d6159671063b6f817e28' 
  AND token = 'x8/Y8iQsrQPg/EXuq7X5o141sBiaTf8zCBW9ZcLVc7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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