SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce5bc9c11888fc5634a117242a4bf1ec36d54a9a424432ad18a3836927c24dc0' 
  AND token = '37vZotIVjtzqUOMdkbsinQT02Hub2oPbcjzJq3B+nZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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