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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2a6290fda7995e3b8fb1f890b3d6a9580e48ac90519dfa6469c859d3e9ae288' 
  AND token = 'eC+BQFJtfy6FT/BhML91YzDTaT5qKj5urB5cW+3QlA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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