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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '858b7d2bd36b0046b1fc63f46ce7af189b23327d17b5397325aae2435c4fec3f' 
  AND token = 'fgMADPc/BYAriCMIN/MHaUiqBRyE7a2hN5G1a0opzXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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