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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aff7c3ee3ed8470f49e1ba96f77316f6d53306d93fa327be409dec6a3bc19461' 
  AND token = 'e6/k1GhijEH2X1E6QY2OgbdB2VPNkv1bkEOnK/1BMX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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