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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '168d32e95aa543f2155bd6707e5b8868ed1cd8d3c6d7431050b489867902f02d' 
  AND token = '3sYZ2CAoV6UKQZmX6j7GswSBQZ68e9e1aQLT6EUEUqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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