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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a639ad19c03a98e6b75fdac56d0514f4df69c7a4df2377ee50c43192552301f' 
  AND token = 'AbypvnGmbE4Oo3breojpPt3qBdKjL/JdjCxWx7l0YTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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