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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7f4286ba098e4a0d58e844aedb234f002bd55102bda2311bc7dc4a1432abd44' 
  AND token = 'GICfrT40HttVBweDf1lLHo6xd9yfKWMkGRjuRz32tP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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