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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89021b1756caf1c45a3653d995b23cd79835168288d0e4317178ea4eaf57d7b3' 
  AND token = 'C1OEmePx99FiFydrsSK2JHFT4QazBqEprh4rONBUHP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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