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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0220cfe21d50eff4151ccacab38fb8e05153c9b531c67e1b4540bfa2ce3ce354' 
  AND token = 'Au8gv5tt8RbomUGl3beToNGAvn97MSD31NQK6C5k4bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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