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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a540e8c27afb9184f01a72a6eab203189a723d8f0e2a72caf3236a4c91255e00' 
  AND token = 'tCo7AcFZBLODiOHMVW98E6wXavX1QN2si/l9ywdrxlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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