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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebef5285805c5fe5556240cfd005196d7197e1e93281055abfa76e683bab15b2' 
  AND token = 'MH0nGGHndgMH7v78ALpCJyu+xlnTDJnmzfbBhOyJbvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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